simple differential

This modelling method completely removes the intrinstic errors of existing grey differential fitting methods, and expands the application range of GM ( 1,1) Moreover, its computational method is simple, and its computational effort is less than that of the grey differential fitting method.

本文所给建模方法，彻底根除了现有灰色微分拟合法存在的固有误差，拓广了GM（1,1）的应用范围，且计算方法简单，计算工作量小于灰色微分拟合法。

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Basic public health services in rural areas were composed of simple public health services, quasi bottommost ensurance and differential ensurance in public health services.

农村基本公共卫生服务包可分为纯公共卫生服务、准公共最低保障卫生服务、准公共差别保障卫生服务三大类。

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A static hysteresis loop test instrumentation is developed, detecting pulse peak by method of cross-zero of pulse peak after differential, acquiring data by microcontroller, displaying hysteresis loop by graphic LCD The test instrumentation has advantages of simple circuit, accurate measurement and visual result.

用脉冲峰值微分过零法检测峰值，单片机采集数据，图形液晶显示磁滞回线，研制静态磁滞回线测试仪，电路简洁，测量准确，结果直观。

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Solving with the Lagrange Equation, the mentality is clear, is two steps ordinary differential equation, but the Hamilton Canonical Equation is a step ordinary differential equation, the form is simple and easy to operat.

用拉格朗日方程解决，思路清晰，是一个二阶常微分方程组；而哈密顿正则方程则是一个一阶常微分方程组，形式简单，使用方便。

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Three dimensional beam propagation method based on the series expansion method ( 3D SEM BPM) transform the BPM into the first order normal differential equations. The method has the merits of simple calculation and high calculation efficiency.

三维级数展开的光束传播法（3D SEM BPM）将BPM方程转化为一阶常微分方程组，具有计算方法简单和计算效率高的优点。

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